.loading{
    width: 100%;
    height: 100%;
    position: absolute;
    z-index: 1000;
}

.circle-size-1x, .circle-size-s{
    width: 8px;
    height: 8px;
    box-shadow: -14px 0 0 red;
}

.circle-size-2x, .circle-size-m{
    width: 16px;
    height: 16px;
    box-shadow: -26px 0 0 red;
}

.loading-circle{
    margin: 40px auto;
    position: relative;
    background-color: black;
    border-radius: 50%;
    animation: circleRotate 1s ease-in-out infinite alternate;
}

@keyframes circleRotate {
    0% {
        opacity: 0.1;
        transform: rotate(0deg) scale(0.5);
    }

    100% {
        opacity: 1;
        transform: rotate(360deg) scale(1.2);
    }
}